doc: fix missing xref

Reported by xolodho.

* doc/bison.texi (Printer Decl): here.

THANKS

@@ -1,7 +1,7 @@
 Bison was originally written by Robert Corbett.  It would not be what
 it is today without the invaluable help of these people:
 
-Аскар Сафин              [email protected]
+Аскар Сафин               [email protected]
 Airy Andre                [email protected]
 Akim Demaille             [email protected]
 Albert Chin-A-Young       [email protected]
@@ -66,9 +66,9 @@ Johan van Selst           [email protected]
 Jonathan Fabrizio         [email protected]
 Jonathan Nieder           [email protected]
 Juan Manuel Guerrero      [email protected]
-Ken Moffat                [email protected]
 Kees Zeelenberg           [email protected]
 Keith Browne              [email protected]
+Ken Moffat                [email protected]
 Laurent Mascherpa         [email protected]
 Lie Yan                   [email protected]
 Magnus Fromreide          [email protected]
@@ -114,9 +114,9 @@ Raja R Harinath           [email protected]
 Ralf Wildenhues           [email protected]
 Richard Stallman          [email protected]
 Rici Lake                 [email protected]
+Rob Conde                 [email protected]
 Rob Vermaas               [email protected]
 Robert Anisko             [email protected]
-Rob Conde                 [email protected]
 Roland Levillain          [email protected]
 Satya Kiran Popuri        [email protected]
 Sebastian Setzer          [email protected]
@@ -146,6 +146,7 @@ Wojciech Polak            [email protected]
 Wolfgang S. Kechel        [email protected]
 Wolfram Wagner            [email protected]
 Wwp                       [email protected]
+xolodho                   [email protected]
 Zack Weinberg             [email protected]
 
 Many people are not named here because we lost track of them.  We